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Title |
Determination of Steel-Concrete Interface Parameters : Bonded and Unbonded Slip Tests
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Keywords |
강-콘크리트 계면 ; 계면상수 ; 계면슬립실험 ; Mohr-Coulomb 파괴규준 ; 구속압 steel-concrete interface ; interface parameters ; interface slip test ; Mohr-Coulomb failure criterion ; confining pressure |
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Abstract |
Experiments on steel-concrete interface are performed to investigate and determine the mechanical roles and properties of interface parameters. The intrinsic different nature of bonded and unbonded interfaces are addressed based on the experimental observations that were obtained from two types of tests considering bonded and unbonded interfaces. The unbonded tests are performed for the specimens that are in unbonded when the initially bonded specimens are tested first. Four cases of lateral confinements including pure slip, and low and medium levels of lateral pressure are taken into account to investigate the effects of lateral confinements on interface behavior. It is shown that the maximum shear strengths, the levels of residual strengths and the Mode II fracture energy release rates are linearly related to the confinement levels. Based on the experimental evidences obtained from this study, the values of interface parameters required in a steel-concrete interface constitutive model will be presented in the companion paper.
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